Fix flaky test

[pretty-parrot]

What is the purpose of this PR

• This PR patches wopmars/tests/test_wopmars.py::TestWopmars::test_dry_run and prevents it from failing when it is run after wopmars/tests/test_tool_wrapper_thread.py::TestToolWrapperThread::test_run
• Test is flaky (non-deterministic) and fails due to some state set up by wopmars/tests/test_tool_wrapper_thread.py::TestToolWrapperThread::test_run, but the test passes when it is run by itself otherwise

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Expected Result

• Test wopmars/tests/test_wopmars.py::TestWopmars::test_dry_run should pass when run both by itself and after wopmars/tests/test_tool_wrapper_thread.py::TestToolWrapperThread::test_run

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Actual Result

• Test wopmars/tests/test_wopmars.py::TestWopmars::test_dry_run fails when it is run after wopmars/tests/test_tool_wrapper_thread.py::TestToolWrapperThread::test_run
• Specifically, we get the following:

____________________________________________________________________________________________ TestWopmars.test_dry_run _____________________________________________________________________________________________

self = <wopmars.tests.test_wopmars.TestWopmars testMethod=test_dry_run>

    def test_dry_run(self):
        cmd_line = ["python", "--dry-run", "-D", self.__db_url, "-w", self.__example_def_file1, "-v", "-d",
                    self.test_path]
        with self.assertRaises(SystemExit) as se:
            WopMars().run(cmd_line)
        # The tests is that these files do not exist
>       self.assertFalse(os.path.exists(os.path.join(self.test_path, 'outdir/output_file1.txt')))
E       AssertionError: True is not false

/home/ar-vi/wopmars/wopmars/tests/test_wopmars.py:207: AssertionError

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Reproduce the test failure

• Run python3 -m pytest wopmars/tests/test_tool_wrapper_thread.py::TestToolWrapperThread::test_run wopmars/tests/test_wopmars.py::TestWopmars::test_dry_run

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Why the Test Fails

• The test fails because of some "pollution"/state that is set by wopmars/tests/test_tool_wrapper_thread.py::TestToolWrapperThread::test_run .

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Fix

• The changes in this pull request clean up the state caused by the test run prior and makes the test pass.

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[sonarqubecloud]

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